Initializing UITextView in a thread -- Causing issue

Question

When I am trying to execute in a thread:

UITextView *aDescriptionView = [[UITextView alloc] initWithFrame:CGRectMake(0, 0, 25, 50)];

I am getting this error:

bool _WebTryThreadLock(bool), 0x2819b0: Tried to obtain the web lock from a thread other than the main thread or the web thread. This may be a result of calling to UIKit from a secondary thread. Crashing now...

What went wrong here? What should I do? I have to have this in a separate thread as it returns me a UIView object.

The GUI should NEVER be done in a secondary thread. – Antwan van Houdt Jan 29 '11 at 01:35 — Antwan van Houdt, Jan 29 '11 at 01:35

score 5 · Accepted Answer · answered Jan 29 '11 at 01:36

5

You must not access UI from any thread besides the main thread. Ever.

answered Jan 29 '11 at 01:36

seppo0010

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Does this include accessing properties, such as [myTextView text] ? – Itamar Katz Jan 29 '11 at 13:52
I think it is safe if you are only reading info, but I am not sure. – seppo0010 Jan 29 '11 at 13:59

Initializing UITextView in a thread -- Causing issue

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